View single post by chuckcm14
 Posted: 02-09-2020 04:21 pm
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chuckcm14

 

Joined: 11-14-2019
Location: Lawsonville, North Carolina USA
Posts: 10
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JH #20152 rubber bumper born 2/75 engine B74 036394 purchased 11/19.
Car is in vg shape no rust. I have been doing various projects, electrical, window seals etc. Do to small leaks I decided to replace the cam cover gasket with new rubber ones.
Checked the valve clearance and found that both inlet and exhaust valve clearances were below min but consistent. Clearances below min of .005 inlet requirement are measured at .003 to .004.
Clearances below min of .010 exhaust requirement are measured at .006 to .008
One of the previous owners rebuilt the engine with high compression pistons (9:5 to 1), head rework and performance cam installed and other items.

Q: Would the performance cam be the reason for the clearances being below min requirements?

Q; I assume I have to change the shims so what would be the best clearances to accomplish. Min of .005 for the inlet valve and max of .012 for the exhaust valve?

Q: Since none of measurements are above min I assume I can measure each shim where needed and replace it with a shim .xxx size less to obtain the larger correct clearance.
Appreciate any comments.

Chuck Mcdonald